Implement Equals and HashCode

Internally, RequestMatcher is sometimes used as a key to a
HashMap. Accordingly, each implementation should implement
equals and hashCode.

Closes gh-17842

Author: jzheaux

web/src/main/java/org/springframework/security/web/util/matcher/MediaTypeRequestMatcher.java

@@ -20,6 +20,7 @@
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
+import java.util.Objects;
 import java.util.Set;
 
 import jakarta.servlet.http.HttpServletRequest;
@@ -251,6 +252,26 @@ public void setIgnoredMediaTypes(Set<MediaType> ignoredMediaTypes) {
 		this.ignoredMediaTypes = ignoredMediaTypes;
 	}
 
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj) {
+			return true;
+		}
+		if (!(obj instanceof MediaTypeRequestMatcher that)) {
+			return false;
+		}
+		return Objects.equals(this.contentNegotiationStrategy.getClass(), that.contentNegotiationStrategy.getClass())
+				&& Objects.equals(this.useEquals, that.useEquals)
+				&& Objects.equals(this.matchingMediaTypes, that.matchingMediaTypes)
+				&& Objects.equals(this.ignoredMediaTypes, that.ignoredMediaTypes);
+	}
+
+	@Override
+	public int hashCode() {
+		return Objects.hash(this.contentNegotiationStrategy.getClass(), this.useEquals, this.matchingMediaTypes,
+				this.ignoredMediaTypes);
+	}
+
 	@Override
 	public String toString() {
 		return "MediaTypeRequestMatcher [contentNegotiationStrategy=" + this.contentNegotiationStrategy

web/src/main/java/org/springframework/security/web/util/matcher/NegatedRequestMatcher.java

@@ -16,6 +16,8 @@
 
 package org.springframework.security.web.util.matcher;
 
+import java.util.Objects;
+
 import jakarta.servlet.http.HttpServletRequest;
 
 import org.springframework.util.Assert;
@@ -47,6 +49,22 @@ public boolean matches(HttpServletRequest request) {
 		return !this.requestMatcher.matches(request);
 	}
 
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj) {
+			return true;
+		}
+		if (!(obj instanceof NegatedRequestMatcher that)) {
+			return false;
+		}
+		return Objects.equals(this.requestMatcher, that.requestMatcher);
+	}
+
+	@Override
+	public int hashCode() {
+		return Objects.hash(this.requestMatcher);
+	}
+
 	@Override
 	public String toString() {
 		return "Not [" + this.requestMatcher + "]";

web/src/main/java/org/springframework/security/web/util/matcher/RequestHeaderRequestMatcher.java

@@ -16,6 +16,8 @@
 
 package org.springframework.security.web.util.matcher;
 
+import java.util.Objects;
+
 import jakarta.servlet.http.HttpServletRequest;
 import org.jspecify.annotations.Nullable;
 
@@ -91,6 +93,23 @@ public boolean matches(HttpServletRequest request) {
 		return this.expectedHeaderValue.equals(actualHeaderValue);
 	}
 
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj) {
+			return true;
+		}
+		if (!(obj instanceof RequestHeaderRequestMatcher that)) {
+			return false;
+		}
+		return Objects.equals(this.expectedHeaderName, that.expectedHeaderName)
+				&& Objects.equals(this.expectedHeaderValue, that.expectedHeaderValue);
+	}
+
+	@Override
+	public int hashCode() {
+		return Objects.hash(this.expectedHeaderName, this.expectedHeaderValue);
+	}
+
 	@Override
 	public String toString() {
 		return "RequestHeaderRequestMatcher [expectedHeaderName=" + this.expectedHeaderName + ", expectedHeaderValue="